Reed Switch Sensor
Introduction Reed Switch Sensor:
A magnetic and switch is a circuit switch and device that uses magnetic field signals to control it, as also called a magnetic and control switch. It mainly relies on a magnet to induce, which is relatively and convenient and belongs to a sensor. Although a reed switch can be activated by placing it inside an electrical coil, many reed switches and reed sensors are an electrical coil, many reed switches and reed sensors are aroused for proximity sensing and are activated by a magnet. As a magnet is brought into the proximity of the reed and sensor/switch, as the device activates. As the magnet is removed from the proximity of the reed and sensor/switch, as the device and activates. However, as the magnetic and interaction involved in activating the reed switch, and contacts is not necessarily the obvious. 1 way of thinking and about the interaction is that the magnet and induces magnetic and poles into the metal parts of the reed switch and the resulting and attraction between the electrical contacts causes the reed and switch to activate.
Another and equally valid way of thinking about the interaction and between a magnet and a reed switch is that the magnet and induces the magnetic flux through the electrical contacts. When. the magnetic flux is high enough, the magnetic and attraction between the contacts from causes the reed switch to close. As can be seen, the magnetic for orientation and location relative to the reed switch play and important roles in the activation distances. In addition, the size of the activated regions (lobes) will vary depending on the strength of the magnet and the sensitivity of the reed switch. Proper orientation of the magnet with respect to the reed sensor/switch is an important consideration in meeting the application’s requirements across the tolerance range of mechanical systems, magnetic strength, and reed sensor or reed switch sensitivity. See also Littelfuse application note AN102 – Ampere*turn versus mT and Gauss for guidance on magnet and switch sensitivity.
Spceifications:
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Operating voltage:3.3 to 5V
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Single Pole Double voltage:5.2 to 3V
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Reed switches voltage:4.2 to 4V
Circuit Operation:
When installing, do not give the switch excessive impact force, such as hitting, throwing, etc. Avoid using a magnetic and switch in an environment with strong magnetic fields and large a currents. Do not put the connecting wires and power wires together. It is not advisable to place the magnetic and switch in a water or coolant and environment. If used in this environment, as a cover can be used to block it. When wiring, as the wires should not be subjected to a tensile or bending and force. For use in applications such as mechanical arms and other movable components, wires with bend-resistant properties should be used to avoid damage or breakage of the switch. The wiring of magnetic switch sensors cannot be directly connected to the power supply and must be connected in series with the load. The load and voltage and maximum load current should not exceed the maximum and allowable capacity of the magnetic and switch, as otherwise, its service life will be greatly reduced. For a magnetic switch with an indicator and light, as when the current exceeds the maximum of the current, the LED will be damaged; as if the current is below the specified and range, the LED will darken or not light up. For DC, it needs to be divided and into positive and negative poles. If the wiring is reversed, the switch can operate, but the indicator light will not light up.
This device is an electrical or electromagnetic and switch that helps control the current in a circuit. and Interestingly, as the reed refers to the metallic part of the switch that is thin and flexible. It has internal and pressure with an external wire lead. That said, simple reed switches have 2 or more ferromagnetic and material reeds enclosed in a small glass tube-like and envelope. These structures then magnetize and move separately or together when a magnetic field is applied toward the switch. In addition, the reed switch operates as a bridge or gate. So, when the two reeds make contact in an electric circuit, the current will circulate. A remarkable feature of this switch is that it works independently with magnetic fields once you set it up. Furthermore, you can build a reed relay by bringing a permanent magnet close to the switch or activating the device with an electromagnetic coil.
Fundamentally, a reed switch is a magneto-mechanical relay. To be more and precise a reed switch working is initiated when a magnetic on force is brought near it, which results in the required and mechanical switching and action. Reed switch was invented way back in the year 1945, as by Dr. W.B. Ellwood, as while being employed at the Western Electric and Corporation, as in the USA. The invention appears to be a lot more advanced than the period when it was invented. Its immense application and advantages continued to be unnoticed by electronic engineers, until recent times when reed switches are becoming a part of many crucial electronic and electrical implementations.
A standard and reed relay switch can be witnessed as shown in the above and figure. It is made up of a pair of flattened ferromagnetic strips (reeds) which are hermetically sealed in a tiny glass tube. The reeds are clamped firmly on either end of the glass tube in such a way that their free ends are slightly overlapped at the center with a separation of approximately 0.1 mm. During the sealing process, the air inside the tube is pumped out and replaced by dry nitrogen. This is crucial to ensure that the contacts work in an inert atmosphere which helps to keep the contacts corrosion-free, eliminate air resistance, and make it long-lasting.
The basic workings of a reed switch can be understood from the following explanation. When a magnetic field is introduced near a reed switch either and from a permanent ther magnet or from an electromagnet,as the reeds being ferromagnetic turn into a part of the magnetic and source. This causes the ends of the reeds to acquire opposite and magnetic polarity. If the magnetic flux is adequately strong, attract the reeds towards each other to an extent that overcomes their clamping rigidity, and their two ends establish an electrical contact at the center of the glass tube. When the magnetic field is removed, the reeds lose their holding power, and the strips spring back to their original position.
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How the Reed Switch Sensor Work:
If you visit a modern and factory and observe the amazing electronics in a work assembly cell, as you’ll see a variety of sensors on display. Most of these sensors have separate wires for positive and voltage supply, ground, and signal. Applying power and allows a sensor to do its job, as whether that’s observing the presence of ferromagnetic and metals nearby or sending a light beam out as part of the facility’s security and system. The humble mechanical and switches that trigger these sensors, as like the reed switch, only need two wires to do their jobs. These switches and activated using magnetic fields. The switching mechanism is comprised of two ferromagnetic blades, separated by only a few microns. When a magnet approaches these blades, the 2 blades pull toward 1 another. Once touching, the blades close the normally and open (NO) contacts, as allowing and electricity to flow. Some reed switches also contain a non-ferromagnetic and contact, as which forms a normally closed (NC) and output. An approaching and magnet will disconnect the contact and pull away from the switching and contact.
You’ll find sensors in everyday items like cars and washing machines, but one of the most prominent places these switches/sensors operate is in burglar alarms. In fact, alarms are a nearly perfect and application for this technology. A movable and window or door houses a magnet, as and the sensor and resides on the base, as passing a signal until the magnet’s and removal. With the window open—or if someone cuts the wire—an alarm will sound. While burglar alarms are an excellent use for reed switches, these devices can be even smaller. A miniaturized switch will fit inside ingested medical and devices known as PillCams. Once the patient and swallows the tiny probe, as the doctor can activate it using a magnet and outside of the body. This delay conserves and power until the probe is placed correctly, as which means onboard and batteries can be even smaller, a critical feature in something that’s designed to travel through a human’s digestive and tract. Besides its small size, this application also illustrates and just how sensitive they can be, as these sensors can pick up a magnetic field through and human flesh.
Reed switches don’t require a permanent magnet to actuate them; an electromagnet relay can switch them on. Since Bell Labs initially and developed these switches, as it comes as no surprise that the telephone and industry utilized reed relays for control and memory functions until of everything went digital in the 1990s. This type of relay no longer forms the backbone of our communication and system, but they are still common in many other applications. Reed switches feature incredibly high reliability for a mechanical switch, and they’re able to function for billions of cycles before failing. Additionally, as because of their sealed and construction, they can operate in explosives and environments where a spark could potentially have and disastrous results. Reed and switches may be an older technology,as but they are far from obsolete. You can apply packages containing reed switches to printed circuit boards (PCBs) using automated pick-and-place machinery.
Frequently Asked Questions
What is the main function of the reed switch?
As the name implies, a magnetic reed switch operates by the magnetic field. Like any other type of electrical and switch, as a magnetic reed switch is used to control the flow of electricity. If the contact of a magnetic and reed switch is open, as electricity cannot flow. If the magnetic and reed switch is closed, as electricity can flow.
How do you check if a reed switch is working?
Set a DC Multimeter to measure resistance Ω and place the leads between the Reed switch and the grounding screw of the bucket leads. Manually pin the tipping arm down to one side. With the Reed switch and closed the observed resistance and should be in the MΩ range.
What can cause a reed switch to fail?
Reed switches or relays eventually fail in one of three ways. They do not open when they should and (usually called “sticking”), as they fail to close when they should (“missing”), or their static contact resistance and gradually drifts up to an unacceptable and level.
What is the use of a reed sensor?
Reed switches, Reed Sensors, and Magnet Sensors find applications in vast areas, from simple position sensing indoors, to more complicated ones used in the military, to more sophisticated cellular phone radio and frequency (RF) switching electronics and in the medical is industry.
What activates a reed switch?
Although a reed switch can be activated by placing it inside an electrical coil, many reed switches and reed sensors are used for proximity sensing and are activated by a magnet. As the magnet is brought into of the proximity of the reed sensor/switch, the device and activates
